How to Connect Through Proxies Using UTLS and HTTP 1.1 Requests?

How to Utilize proxies while connecting via UTLS and HTTP 1.1 Request

In the realm of network communication, the ability to connect through proxies while utilizing UTLS (an implementation of the TLS protocol) and HTTP 1.1 requests is a valuable capability. This allows developers to establish secure connections to hosts through intermediary servers, addressing various network access and security scenarios.

To achieve this, a custom dialTLS function can be employed. This function takes three parameters: network (the network type, such as "tcp"), addr (the address to connect to), and cfg (the TLS configuration object). Here's an example of a custom dialTLS function that supports both HTTP and SOCKS5 proxies:

import (
    "crypto/tls"
    "net"
    "net/url"
    
    "github.com/magisterquis/connectproxy"
    "golang.org/x/net/proxy"
    utls "github.com/refraction-networking/utls"
)

var proxyString = "http://127.0.0.1:8080"

dialTLS := func(network, addr string, _ *tls.Config) (net.Conn, error) {
    // Parse the proxy URI
    proxyURI, _ := url.Parse(proxyString)

    // Create a proxy dialer based on the scheme
    var proxyDialer proxy.Dialer
    switch proxyURI.Scheme {
    case "socks5":
        proxyDialer, err = proxy.SOCKS5("tcp", proxyString, nil, proxy.Direct)
    case "http":
        proxyDialer, err = connectproxy.New(proxyURI, proxy.Direct)
    }

    // Dial the proxy to establish a net.Conn
    conn, err := proxyDialer.Dial("tcp", addr)
    if err != nil {
        return nil, err
    }

    // Create a UTLS client using the established net.Conn
    uconn := utls.UClient(conn, cfg, &utls.HelloRandomizedALPN)
    return uconn, nil
}

Within this function, it's important to consider a few suggestions to enhance its usability and flexibility:

1. Leverage the "connectproxy" module if the intent is to tunnel through an HTTP CONNECT proxy.
2. For a simplified approach, explore the Meek pluggable transport source for Tor. It provides a comprehensive 'utls.go' module that handles both HTTP and HTTP2 transports and supports SOCKS5.

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